x=- \frac{ 5 }{ 4 } y+7(4
Solve for y
y=\frac{112-4x}{5}
Solve for x
x=-\frac{5y}{4}+28
Graph
Share
Copied to clipboard
x=-\frac{5}{4}y+28
Multiply 7 and 4 to get 28.
-\frac{5}{4}y+28=x
Swap sides so that all variable terms are on the left hand side.
-\frac{5}{4}y=x-28
Subtract 28 from both sides.
\frac{-\frac{5}{4}y}{-\frac{5}{4}}=\frac{x-28}{-\frac{5}{4}}
Divide both sides of the equation by -\frac{5}{4}, which is the same as multiplying both sides by the reciprocal of the fraction.
y=\frac{x-28}{-\frac{5}{4}}
Dividing by -\frac{5}{4} undoes the multiplication by -\frac{5}{4}.
y=\frac{112-4x}{5}
Divide x-28 by -\frac{5}{4} by multiplying x-28 by the reciprocal of -\frac{5}{4}.
x=-\frac{5}{4}y+28
Multiply 7 and 4 to get 28.
Examples
Quadratic equation
{ x } ^ { 2 } - 4 x - 5 = 0
Trigonometry
4 \sin \theta \cos \theta = 2 \sin \theta
Linear equation
y = 3x + 4
Arithmetic
699 * 533
Matrix
\left[ \begin{array} { l l } { 2 } & { 3 } \\ { 5 } & { 4 } \end{array} \right] \left[ \begin{array} { l l l } { 2 } & { 0 } & { 3 } \\ { -1 } & { 1 } & { 5 } \end{array} \right]
Simultaneous equation
\left. \begin{cases} { 8x+2y = 46 } \\ { 7x+3y = 47 } \end{cases} \right.
Differentiation
\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Integration
\int _ { 0 } ^ { 1 } x e ^ { - x ^ { 2 } } d x
Limits
\lim _{x \rightarrow-3} \frac{x^{2}-9}{x^{2}+2 x-3}